Back-pedaling brake.



No. 630,431. Patented Aug. 8, I899. EFM. WILDEY.

BACK PEDALING BRAKE.

(Applicatiqn filed Dec. 8, 1898.)

(No Model.)

Wiirwras.

Mgfhu THE NORRIS PETERS co. FnOIO-LITHQ, msumn'rou. 0.1:

UNITED STATES P TENT Erica.

BACK-PEDALING BRAKE.

SPECIFICATION forming part of Letters Patent No. 630,431, dated August8,1899. Application filed December 8, 1898. Serial No. 698,645. (Nomodel.)

T 0 to whom it may concern.-

Be it known that I, EDWARD MILTON WIL- DEY, a subject of the Queen ofGreat Britain, and a resident of 2 Commercial Chambers, Manse street,Dunedin, NewZealand, have invented an Improved AdjustableBrake forBicycles and the Like, of which the following is a specification.

This invention relates to brakes, and more especially to those used uponbicycles; and the object of the invention is to provide a strong,simple, and eiiicien't brake which when fitted to such a piece ofmechanism as a bicycle will operate when pressure is applied to thepedals in a direction reverse to that employed for propelling themachine forward.

In applying the invention to a bicycle'I fix upon the rear hub a sleeveor collar provided with a flange and a groove, and in the groove I fixtwo pins. The sprocket-wheel of'this rear hub fits freely upon thesleeve, so that it may revolve thereon. Two brake blocks or arms arepivoted to the face of the sprocket and have slit ends which take intothe aforesaid groove of the sleeve. The pivoted ends of these brakeblocks are furnished with hooks.

In propelling the machine the sprocket- Wheel carries around, thebrake-blocks, the hooks of which engage with the aforesaid pins andrevolve the sleeve and wheel. Upon the motion of the wheels beingarrested, or partially so, the pin runs up the eccentric face of in thedifferent parts and has a pin resting upon the frame of the machine andis thus held from revolving.

The appended drawings illustrate the invention as applied to a bicycle,and will now be referred to for purposes of a detailed description.

Figure 1 is a rear view of a bicycle-hub fitted with the invention. 7 ofthe same. Fig. 3 illustrates the hub with the sprocket-Wheel,brake-blocks, and cap removed. Fig. 4 is an end view of the same. Fig. 5is an end View of the sprocket-Wheel, showing the position of thebrake-blocks whenthe brake is applied. Fig. 6 is a similar view showingthe position of the blocks 'face 15 by the ordinary nut 16.

Fig. 2 is a side view is fastened thereto in any other convenientmanner. This said sleeve has a flange 4 and groove 5,across which thepins extend. The rear sprocket-wheel 7 fits freely upon the sleeve 1against the flange 4 and is furnished with brake-blocks 8, pivoted uponpins 9. Near the pivots 9 these said brake-blocks are formed into hooks10 and have their ends 11 provided with slits 12, their thickness beingsuch that they will pass into the groove 5 with some considerablefriction. The cap 13 fits upon the axle 14 and-is held against the Thepin 17, secured to the cap 13, rests upon the chainstay 18. A screw 19in the said cap gives access to the conical head 20 of screw 21.

When the pedals are driving the sprocketwheel 7 in a forward direction,the hooks 1O engage with the pins 6 and revolve the sleeve 1, hub 2, andthe rear wheel of the bicycle. Upon a reversal of the pressure upon thepedals the motion of the sprocket wheel is checked and the pins 6 run upthe eccentric faces 22 of the brake-blocks, as shown by Fig. 5, forcingthe same against the interior periphery of the cap, with the result thatthe progress of the machine is partially or wholly arrested, since thesaid cap is prevented from revolving by the pin 17.

Upon a renewal of pressure upon the pedals to drive the machine forwardthe sprocketwheel advances upon the sleeve until the hooks 1O engagewith the pins 6. The pressure then draws the brake-blocks inward, asshown by Fig. 6, and out of contact with the cap.

By means of slits 12 the ends 11 of the brake-blocks are spread open tofit tightly in the groove 5, and thus cause friction against the sidesof the said grooves and prevent the brake coming into or out of actiontoo freely.

The screw 21 and its conical head 20 pro vide means for adjusting thepressure of the brake-blocks against the cap, since a certain amount ofspring exists in the diiferent parts.

By screwing the screw into the sprocketwheel the range of movement ofthe blocks will be reduced, and by withdrawing the same an oppositeeflect is produced, or by screwing the screw hard down the brake may be,

prevented from being brought into action altogether. taking out thescrew 19 and reaching the screw 21 through the hole in the cap.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatWhat I claim is 1. In combination with the hub of the wheel, a sleevesecured thereto and having a circumferential groove, pins extendingacross said groove, a sprocket-wheel fitted on the sleeve to turnthereon, brake-blocks pivoted to the face of the sprocket-wheel, saidbrake-blocks having hooked ends to engage the pins and having also edgesagainst which the pins bear in back-pedaling to force the blocks-ont-Wardly, said blocks having also slitsin their ends leaving sidesslightly spread apart and fitting in the groove of the sleeve, a capsecured to the axle and extending over the sleeve and brake-blocks andadapted to be borne upon by the latter, and a pin in the cap Thisadjustment may be made by resting on the machine-frame, substantially asdescribed. I p

2. In combination'with the hub of the wheel, a sleeve secured theretoand having acircumferential groove, pins extending across said groove, asprocket-Wheel fitted on the sleeve to turn thereon, brake-blockspivoted to the face of the sprocket-wheel, said brake-blocks havinghooked ends to engage the pins and having also edges against which thepins bear in back-pedaling to force the blocks outwardly, said blockshaving also slits in their ends leaving sides slightly spread apart andfitting in the groove of the sleeve, a cap secured to the axle andextending over the sleeve and brake-blocks and adapted to be borne uponby the latter, a pin in the cap resting on the maehineirame, a screwhaving a conical head for regulating the action of the brake-block and ascrew in the cap to give access to the regulating-screw, substantiallyas described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

EDWARD MILTON VVILDEY. Witnesses:

A. F. PARK, J. R. PARK.

